Door lock



N.' B.'HURD.

DOOR LOCK.Y

APPLICATION FILED IIIAII. Is, 1922.

Lggpgm l Patented 0et.31922.,

@I ff I Q i I E l I I lltatented @et 3,

i" la NRMAN B. HURD, OFVNEW BRITAIN. CQNNECTICiTT. ASSGNOR TO THE AMERCAN HARDWARE CORPORATION, OF NEW/V BRITAN, GONNECTCUT, A CORPORATION 0F CONN'ETICUT.

BGQR LOCK;

Application lcd March 1B, 1922'. Serial No. 544,846. y

latch and latch dog construction, as will he more fully explained hereinafter.

In the drawings: y F 1g. 1 is a side elevation ot iny improved lock with part oit the housing removed to` show the internal parts.

Fig. 2 is a section on the line 2 2 ot F 1, showing certain parts in elevation.

Fig. 3 is an end elevation ot certain parts.

Fig. 4; is a perspective view ot the latch bolt and dogging device.l

1 is the latch case, which constitutes a housing and support for the various internal parts. 2 is a longitudinally movable spring latch bolt, which projects through the 'tace plate 3 of the lock. 4 is a spring ttor norinally inipelling the latch loolt 2 forwardly. 5 is a latch retracting lever. G represents a roll-back arm, which is operated by a suitable lnoh or handle at the inside ot the door, and 7 represents a roll-hack arni operated by a suitable outside knob or handle. rlhese roll-bach arins niake suitable gageinent with the latch retracting lever 5 to move it in the latch retracting direction, while the spriilg S moves said lever in the opposite direction. lhe lower end ot the latch retracting lever 5 is arranged to engage a shoulder 9 on the tail of' the latch bolt to retract the latch.

Pivotally mounted directly on the latch bolt is a dog, which functions to hold the latch in its projected position, so that it cannot accidentally work hack and release the door when the saine is closed. This dog is both manually and automatically oper ated, that is to say, when the door is being closed it is automatically thrown off as soon as the strike plate encountered, so that a '['nrt-her door closing movement may torce the latch back without danger ot injury. rlhe dog is also manually retracted whenever the latch retracting lever 5 is moved in a reti-acting direction, so as torst release the dog to permit the latch to be tl'iereatter retracted by hand. itall other times the dog serves to elllectively hold the latch in its ln'ojectcd position.

liilhile, broadly speaking, clogging devices tor this purpose are not new, the novelty herein resides in the new construction" and arrangement oi. parts disclosed. in the par-` ticular torinshown herein, the dog coinprises abell crank lever pivoted at 10 rto swing horizontally on the upper side ot the latch bolt and niove with said bolt. The rear end ofthe dog is provided with a locking nose 11, which .is arranged to take into a recessin the side wall ot the lock case, two of such recesses being indicated at 12-12. Depending from the opposite end of the dog is a shoulder 14, and located between this shoulder and the body ot `the latch bolt is a sinall spring 15, which 'functions -to yieldingly nieve the dog normally in the clogging direction. 16 is what l may terni a" latch actuator', or anti-friction device, which comprises a segment shaped piece pivoted to the loch' casefat 17,having.therein a radial cani slot 1S. rilhis actua-tori@ is pret erably located in a horizontal slot in the latch bolt head 2. 19 is a pin carried by the latch bolt head and passing through the slot 1S in the actuator, as best seen in Fig. 2. This actuator 16 also bears against the torward side of the sl'iouldered portion 1.4ion the latch dog.

.ln operation,` assuming the parts stand as shown in Fig. 2 and the door to which the latch .is applied is open, it is obvious that the latch bolt head2 cannot he pushed back by any pressure applied to the outer end. It' the door is closed, the actuator 16 will first hit the strike plate S so that as the door continues to close, the actuator 16 willbe rocked hack.. rlhe first part of this rocking inoveinent will tilt the latch dog so as to release it troni the latch case. Continued niovenient of the door in the closing direction will cause the actuator 16 to continue to swing back, the eiiiect of which will be to repress the latch 2 through the medium ot the pin and cani slot connection previously described. The rear end ot the actuator is rounded so that it will not crowd against the shoulder 14. to the injury thereof as it recedes. As soon as the door is fully closed, obviously the latch bolt 2 will be projected ahead into the keeper slot of the strike plate in the usual manner. This will permit the actuator 16 to resume the position shown in that ligure. So long as the door is closed, itis obvious that the latch bolt head 2 cannot be accidentally or unintentionally repressed to the point where the door might be released.

`When it is desired to open the door the latch retracting lever 5 is actuated by either of the roll backs 6 or 7. The iirst rearward movenient of the lower end of the lever 5 will. Acause'saidend to engage an incline or bevel 21 just forward ot the locking` nose 11, so that said nose will be cammed back out ol the locking' position, before said lever 5 actually encounters the shoulder 9. `When said dog has been freed trom the side ot the housing, the retracting lever 5 will encounterthe shoulder 9, and a continued swinging movement of said retracting lever will Withdraw the latch 2. n

It should be observed that in the form shown the slot 18 is or" suflicient width, to permit ofi a sufficient independent movement of the actuator 16 relatively to the latch so that the first movement of the actuator will be to tree the dogand thereby release the latchfdor repression by the actuator. The arr'e lgement is such that `friction is very greatly reduced, therefore, the actuator may properly be termed an anti-friction device even though friction is not wholly eliminated. By the provision of such a device a more powerful spring l can be successfully employed than would otherwise be practical and of course this is advantageous in such uses as demand liability of action, as for example, use on an automobile door.

Obviously, I have shown my invention in only one form, and wish to have it understood that in many respects the form and arrangement may be modiied without departing from the spirit or scope of the in- 'vention disclosed and claimed.

lVhat I claim is: l

1. ln a lock, a case, a slidinp` spring latch bolt carried thereby, a pivotally mounted antii`riction latch retracting,` actuator, means of connection between said actuator and latch bolt to transiform the rotary movement or' said actuator into rectilinear move ment of said bolt, a dog pivotally mounted upon and carried by said latch bolt, an abutment against which said dog normally engages to hold said latch bolt projected, and operative means of connection between said actuator and said dog to release the latter preparatory to the repression of said bolt by said actuator.

2. ln alocla', a case, a sliding' spring latch bolt carried thereby, a pivotally n'iouuted antidfrictiou latch retracting actuator, means olf connection between said actuator' ant latch bolt to transform the rotary movement of actuator into rectilinear movement of said bolt, a dop,` pivotally mounted upou. and carried by said latch bolt, an abutment against which said dog normally engages to hold said latch bolt projected, operative means of connection between said actuator and said dog` to release the latter preparatory to the repression of said bolt by said actuator, and a manually operable means arranged to retract said latch, said means cooperating with the said dog to release the same preparatory to retractinp,` the bolt.

ln a. lock, a casing, a spring projected reciprocating latch bolt carried thereby, a swinging anti-friction latch actuator also carried thereby and cooperating with said latch to repress the same when said actuator is swung in one direction, a horizontally swinging` dog pivotally mounted on the latch bolt and movable therewith, an abutment `arransied to be :normaliv engraed b said dog` when the latch bolt is fully projected, an operative means of connection between the actuator and the dog to release the same preparatory to the repression ot the latch bolt.

NRMAN Be HURIL 

